MetroPCS HB4J1 Replacement Battery 3.7V 1100mAh

MetroPCS HWM835-R — 3.7V Li-ion Replacement Battery (HB4J1)

This is a 3.7V, 1100mAh Li-ion cell that fits the MetroPCS HWM835-R smartphone. It replaces OEM part numbers HB4J1 and HB4J1H. The cell measures 54.00 × 43.00 × 5.00mm and matches the original connector and BMS handshake.

• HWM835-R fit: The HB4J1 and HB4J1H share the same voltage rail, physical footprint, and BMS communication protocol on the HWM835-R. Swapping between these two OEM part numbers does not require any hardware modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the HWM835-R. The BMS accepted the handshake without error flags, and the fuel gauge IC tracked state-of-charge within normal tolerance after one full cycle.
• First-cycle fuel gauge reset: On first use after installation, disable fast charging and run one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the HWM835-R after a cell swap

This happens when the fuel gauge IC is still calibrated to the old cell's voltage-to-capacity curve. The new cell hits a steeper voltage cliff under modem or screen load, and the phone interprets that drop as a hard shutdown threshold rather than a percentage read. The OS thinks there is charge remaining, but the cell cannot sustain the voltage under peak draw. One full discharge down to automatic shutdown followed by an uninterrupted charge to 100% recalibrates the coulomb counter and eliminates most of these events.

USB charging not detected on the HWM835-R after battery replacement

A newly installed cell with a slightly higher internal impedance can cause the charge IC to stall handshake negotiation on the first connection. The phone may show no charging icon even with a known-good cable. Disconnect the cable, wait 30 seconds, then reconnect — this resets the charge IC negotiation cycle. If the issue repeats, check that the battery connector is fully seated, as a partial connection raises apparent impedance above the charge IC's acceptance threshold.